Natural gas liquefaction system and method and process

The invention discloses a natural gas liquefaction system and method. The natural gas liquefaction system includes a first liquefaction cold box and a second liquefaction cold box; in the first liquefaction cold box, a three-stage pre-cooling section is formed through a propane pre-cooling cycle system to realize the early pre-cooling of natural gas and mixed refrigerant; A two-stage cryogenic section is formed in the second liquefied cold box through a mixed refrigerant cycle system; the inlet end of the three-stage pre-cooling section and the natural gas inlet pipe, the outlet end of the three-stage pre-cooling section and the inlet end of the two-stage cryogenic section Connected, the outlet end of the two-stage cryogenic section is connected with the LNG outlet pipeline, and the LNG outlet pipeline is provided with a sixth throttle valve. The invention simplifies the number of separators in the liquefaction process, greatly reduces the footprint of the equipment, and can use the opening and closing of the valve to freely switch between the stages of the three-stage separation tank according to local conditions, simplifying the investment of equipment at the same time To reduce the production cost of enterprises, it has good promotion value on the offshore floating FLNG platform. Good promotion value. Good promotion value.

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